| 摘要 |
A vehicle having at least four wheels comprising a pair of front wheels and a pair of rear wheels, first and second reversible hydraulic cylinders coupled respectively to the front wheels for turning the same and third and fourth hydraulic cylinders coupled respectively to the rear wheels for turning the same, a hydraulic pressure source, a hydraulic circuit for selectively coupling each of the cylinders to the hydraulic pressure source for simultaneously turning the front and rear wheels whereby the vehicle may be turned in either a right-hand or a left-hand direction. The hydraulic circuit includes a flow controller in circuit between the pressure source and the hydraulic cylinders for bypassing hydraulic fluid around one pair of hydraulic cylinders when that pair of cylinders orients its wheels in a forward direction during a transition from a turn in one direction to a turn in the opposite direction until the other pair of wheels are also oriented in a forward direction, the flow controller being operative to return fluid flow to the one pair of cylinders when both the front and rear wheels are oriented forwardly for continued transitional movement of all wheels to a turn in the opposite direction.
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